Welding protective cover and battery manufacturing equipment
By designing a welding protective cover, and utilizing annular blowing and negative pressure suction to remove welding slag, the problem of welding slag splattering during the welding process was solved, thereby improving the welding quality and reliability of battery cells.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2026-04-03
AI Technical Summary
During the laser welding process of the end cap and adapter plate of the battery cell, spatter can cause the welded area to be unclean, affecting the reliability of the battery cell.
The welding protective cover, including a base, pressure head assembly and outer cover, is designed with an air inlet, laser port and air extraction port. It uses annular blowing and negative pressure suction to remove welding slag during the welding process and ensure that the welded parts are clean.
Reduce the risk of welding slag accumulation, improve welding stability and battery cell reliability, reduce welding slag residue, and improve welding quality.
Smart Images
Figure CN224073604U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and more specifically, to a welding protective cover and battery manufacturing equipment. Background Technology
[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.
[0003] During the battery manufacturing process, a large amount of welding slag is generated during the laser welding of the end caps and adapter plates of the battery cells. This results in unclean welding areas, and the welding slag may even splash onto the battery cells, causing damage and contamination, and affecting the reliability of the battery cells. Utility Model Content
[0004] This application provides a welding protective cover and battery manufacturing equipment, which can reduce the risk of welding slag accumulation and improve the reliability of battery cells.
[0005] This application is achieved through the following technical solution:
[0006] In a first aspect, embodiments of this application provide a welding protective cover, which includes a base and a pressure head assembly. The base has an air inlet, a laser port, and an air extraction port. The pressure head assembly includes a pressure head with a first channel extending through it in a first direction. The two ends of the first channel are a first end and a second end, respectively. The first end is connected to the base, and the laser port and the air extraction port are both connected to the first end. The size of the first channel gradually decreases from the first end to the second end. The pressure head assembly also includes an outer cover, which covers at least a portion of the pressure head in the first direction. A gap exists between the inner peripheral wall of the outer cover and the outer peripheral wall of the pressure head to form a second channel. The air inlet communicates with the second channel. One end of the outer cover is sealed to the pressure head, and the other end of the outer cover is open to form a welding port, which is directly opposite the laser port. The welding port extends beyond the second end, and the second channel communicates with the first channel through the gap between the welding port and the second end.
[0007] In the technical solution of this application embodiment, the base is provided with an air inlet, a laser port, and an air extraction port. The pressure head assembly is located on one side of the bottom of the base, and the pressure head assembly is a combination of a pressure head and an outer cover. The first channel of the pressure head is connected to the laser port and the air extraction port. There is a gap between the inner peripheral wall of the outer cover and the outer peripheral wall of the pressure head, forming a second channel. One end of the outer cover is sealed to the pressure head, and the other end of the outer cover is open, forming a welding port that communicates with the second channel. The welding port contacts the component to be welded, such as an adapter piece. The laser port allows laser light to enter and exit from the welding port, realizing laser welding between the adapter piece and the end cap of the battery cell.
[0008] The air inlet is connected to a blower, and the air outlet is connected to an exhaust device. During laser welding, positive pressure air is blown in through the air inlet. After entering the second channel, the gas is blown out from the welding port at the bottom of the outer cover. The weld slag generated during the laser welding process at the welding port passes from bottom to top through the first channel and is discharged from the exhaust port. Since the welding port extends beyond the second end, there is an annular gap channel between the welding port of the outer cover and the second end of the pressure head. The gap between the welding port and the second end of the pressure head is the air inlet of the second channel. The air blown out of the air inlet towards the weld slag at the welding port is an annular airflow. Compared with the single-point oblique airflow at the welding port in the prior art, this application changes the airflow direction and airflow area at the welding port. The airflow entering the second channel from the air inlet is an annular airflow at the welding port, with a larger airflow area. Moreover, the airflow direction at the welding port is from bottom to top, and the airflow direction at the welding port is in the same direction as the spatter direction of the weld slag at the welding port. On the one hand, this can reduce the risk of adhesion caused by weld slag hitting the end cap of the battery cell and improve welding stability. On the other hand, under the combined effect of the circulating air blowing and the negative pressure suction of the exhaust port, the welding slag generated by laser welding at the weld joint is more likely to enter the first channel from the second end from the bottom up and then be discharged from the exhaust port at the first end. This reduces the risk of welding slag accumulation at the weld joint, and the welding part between the adapter piece and the end cap of the battery cell is cleaner and less likely to have welding slag residue. This improves the welding quality between the adapter piece and the end cap of the battery cell, and correspondingly improves the reliability of the battery cell.
[0009] According to some embodiments of this application, the weld joint extends beyond the second end by 2mm-5mm.
[0010] In the above scheme, limiting the amount by which the weld joint extends beyond the second end ensures that the annular air blowing from the bottom of the second channel has sufficient outlet space to blow the weld slag at the weld joint into the first channel from bottom to top along a predetermined direction. When the amount by which the weld joint extends beyond the second end is less than 2mm, the gap between the weld joint and the second end in the first direction is too small, resulting in a small outlet area and affecting the blowing effect of the annular air on the weld slag. When the amount by which the weld joint extends beyond the second end is greater than 4mm, the gap between the weld joint and the second end in the first direction is too large, resulting in an excessively large outlet area, reducing the annular air velocity at the weld joint, and affecting the slag removal effect of the annular air at the weld joint.
[0011] According to some embodiments of this application, the weld joint is coaxially arranged with the second end, and the diameter of the weld joint is equal to the diameter of the second end.
[0012] In the above scheme, the welding port and the second end are set coaxially, and the diameter of the welding port is equal to that of the second end. That is, the second end is located directly above the welding port, and the opening size of the two is equal. Compared with the welding port and the second end being misaligned or having unequal sizes, when the welding slag at the welding port moves from bottom to top under the action of the negative pressure adsorption force of the circulating air and the exhaust port, the welding slag is more likely to enter the first channel directly from the second end along the direction of the airflow, and is less likely to generate turbulence.
[0013] According to some embodiments of this application, the air inlet and the air outlet are located on both sides of the laser port in a second direction, which is perpendicular to the first direction.
[0014] In the above scheme, the air inlet and air outlet are respectively set on both sides of the laser port. In this way, after the gas enters from one side of the cover plate in the first direction, it is blown out from the other side of the cover plate in the first direction of the laser port. Compared with the air inlet and air outlet being located on one side of the laser port in the second direction, the distance between the air inlet and air outlet in the second direction of the cover plate is larger. Correspondingly, the angle between the air inlet channel and the air outlet channel inside the pressure head assembly can be set to be larger, which is more conducive to the spatial layout of the pressure head assembly channel.
[0015] According to some embodiments of this application, a third channel is provided through the pressure head below the air inlet. The third channel is independently provided from the first channel, and the air inlet is connected to the second channel through the third channel.
[0016] In the above solution, by setting a third channel on the pressure head, the air inlet can be connected to the second channel through the third channel. The air blown in from the air inlet can directly enter the second channel through the third channel. The air inlet does not need to be directly connected to the gap between the pressure head and the outer cover. The flow channel size of the third channel can be set according to the requirements, so that the air inlet can enter the second channel more smoothly and evenly. In addition, there is no need to set a gap between the outer peripheral wall of the pressure head and the part of the outer cover near the base, which is more conducive to the assembly of the pressure head and the outer cover.
[0017] According to some embodiments of this application, the pressure head includes a first sidewall and a second sidewall that are relatively distributed along a second direction, and a third sidewall and a fourth sidewall that are relatively distributed along a third direction. The first sidewall, the third sidewall, the second sidewall and the fourth sidewall are connected in sequence to form a first channel. The air extraction port is located at the first end and is disposed close to the first sidewall. The third channel is disposed through the second sidewall. The first direction, the second direction and the third direction are perpendicular to each other.
[0018] In the above scheme, the pressure head includes a first sidewall and a second sidewall that are relatively distributed along the second direction, and a third sidewall and a fourth sidewall that are relatively distributed along the third direction. The pressure head is formed by the four sidewalls, resulting in a simple structure and easy processing. The air extraction port is located at the first end of the first channel and close to the first sidewall, while the third channel passes through the second sidewall. That is, the air extraction port and the air inlet are located on opposite sides of the second direction, which is more conducive to the rational layout of the airflow inside the pressure head assembly.
[0019] According to some embodiments of this application, the included angle between the first sidewall and the second sidewall is an obtuse angle.
[0020] In the above scheme, the included angle between the first sidewall and the second sidewall is an obtuse angle, that is, the included angle formed by the air inlet, the weld joint and the air outlet is an obtuse angle, which is more conducive to the layout of the air field inside the pressure head assembly. The larger the included angle between the first sidewall and the second sidewall, the more conducive it is to the smooth discharge of welding slag.
[0021] According to some embodiments of this application, the included angle between the first sidewall and the base is smaller than the included angle between the second sidewall and the base.
[0022] In the above scheme, the angle between the first sidewall and the base is smaller than the angle between the second sidewall and the base. That is, the first sidewall is gentler than the second sidewall. The air extraction port is set close to the first sidewall, which makes it easier for the welding slag in the first channel to be discharged along the extension direction of the first sidewall. The gentler first sidewall reduces the difficulty of welding slag discharge and can effectively prevent welding slag from falling into the welding joint, thus improving the welding slag discharge effect.
[0023] According to some embodiments of this application, the cross-sectional shape of the second end is circular, and the cross-sectional shape of the weld joint is circular.
[0024] In the above scheme, the cross-sectional shape of both the second end and the weld joint is circular, which is more conducive to achieving annular blowing of the weld slag at the weld joint, resulting in more uniform airflow and better dust removal effect on the weld slag.
[0025] According to some embodiments of this application, the outer cover and the pressure head are detachably connected.
[0026] In the above solution, the outer cover and the pressure head are detachably connected, making it easy to install and remove the pressure head and the outer cover, which is beneficial for subsequent maintenance of the outer cover and the pressure head.
[0027] According to some embodiments of this application, the pressure head and the base are buoyantly connected along a first direction.
[0028] In the above solution, the pressure head and the base are connected in a floating manner along the first direction, which can reduce the risk of overpressure on the adapter plate by the welding protective cover, so that the pressure head can be completely pressed on the surface of the adapter plate, improving the dustproof effect and ensuring the welding quality.
[0029] According to some embodiments of this application, the number of pressure head assemblies is two, and the two pressure head assemblies are distributed at intervals along a second direction on the base, the second direction being perpendicular to the first direction.
[0030] In the above scheme, the number of pressure head assemblies is set to two. The two pressure head assemblies can simultaneously weld the components to be welded, such as the two adapter pieces on the battery cell, thereby improving the welding efficiency.
[0031] Secondly, this application also provides a battery manufacturing apparatus, which includes the welding protective cover of any of the foregoing embodiments.
[0032] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0034] Figure 1 This is a schematic diagram of the structure of the welding protective cover provided in some embodiments of this application;
[0035] Figure 2 Explosion-proof diagrams of welding protective covers provided in some embodiments of this application;
[0036] Figure 3 for Figure 2 Schematic diagram of the intermediate pressure head;
[0037] Figure 4 for Figure 2 Schematic diagram of the middle base;
[0038] Figure 5 for Figure 4 A front sectional view of the central base.
[0039] Icons: 100-Welding protective cover; 10-Base; 11-Air inlet; 12-Laser port; 13-Exhaust port; 15-Slot; 20-Pressure head assembly; 21-Pressure head; 211-First channel; 2111-First end; 2112-Second end; 212-Third channel; 213-First sidewall; 214-Second sidewall; 215-Third sidewall; 216-Fourth sidewall; 217-Second connecting hole; 218-Hanging part; 22-Outer cover; 221-Welding port; 222-First connecting hole; 23-Second channel; 30-Floating assembly; 31-Guide rod; 32-Guide sleeve; 33-Spring; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation
[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.
[0042] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.
[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0044] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0045] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).
[0046] A single battery cell includes components such as a casing, end caps, electrode terminals, adapter plates, electrode assemblies, and electrolyte.
[0047] An end cap is a component that covers the opening of a battery casing to isolate the internal environment of a single battery cell from the external environment. In some embodiments, the shape of the end cap may be adapted to the shape of the casing to fit the casing. In some embodiments, the end cap may be made of a material with a certain degree of hardness and strength, so that the end cap is not easily deformed under pressure or impact, enabling the battery cell to have higher structural strength and improved safety performance. The material of the end cap can be diverse, including copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.
[0048] In some embodiments, the end cap may be provided with electrode terminals, which can be used for electrical connection with electrode assemblies for outputting or inputting electrical energy. The electrode terminals include a positive terminal and a negative terminal. In some embodiments, the end cap may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell reaches a threshold.
[0049] The housing is a component used to fit with the end cap to form the internal environment of a battery cell. The internal environment formed by the housing and the end cap together can be used to house components such as electrode assemblies and electrolytes. In some embodiments, the housing and the end cap can be separate components, and an opening can be provided on the housing, with the end cap closing the opening to form the internal environment of the battery cell.
[0050] In some embodiments, the end cap and housing can be integrated. Specifically, the end cap and housing can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing, the end cap is then used to close the housing. The housing can be of various shapes and sizes, such as cuboids, cylinders, hexagonal prisms, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode assembly. The material of the housing can be diverse, and it can be made of materials such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.
[0051] An electrode assembly is the component in a battery cell where an electrochemical reaction occurs. The casing may include one or more electrode assemblies. An electrode assembly includes electrodes of opposite polarity (i.e., a positive electrode and a negative electrode) and a separator located between the electrodes of opposite polarity to prevent short circuits. The positive electrode, separator, and negative electrode can be formed by winding, stacking, or other methods. In the electrode assembly, the portions of the electrodes (positive and negative electrodes) containing active material, together with the separator, constitute the main body of the electrode assembly. The portions of the electrodes without active material each constitute a tab, which serves as the current transmission terminal of the electrode assembly for transmitting current. The tab of the positive electrode is called the positive tab, and the tab of the negative electrode is called the negative tab. The positive and negative tabs can be located together at one end of the main body or at opposite ends of the main body.
[0052] An adapter is a current collector that electrically connects the tabs of an electrode assembly to the corresponding electrode terminals. Adapters include positive and negative adapters. The positive tab of the electrode assembly can be electrically connected to the positive terminal via the positive adapter, and the negative tab can be electrically connected to the negative terminal via the negative adapter, forming a current loop. The adapter can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloys. Its shape can also be varied, including square, round, and irregular shapes. The positive and negative adapters can have the same or different shapes.
[0053] From a market perspective, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.
[0054] The development of battery technology must take into account multiple design factors, such as performance parameters like energy density and charge / discharge rate. In addition, battery reliability also needs to be considered.
[0055] Currently, during the welding of adapter plates to the end caps of battery cells, laser welding generates a large amount of welding slag. This slag accumulation leads to unclean welding areas. If not removed promptly during the welding process, fumes / plasma clouds can obstruct or deflect the laser, causing laser energy attenuation and resulting in shallow weld pools or even incomplete welds. Simultaneously, welding slag spatter can impact the welding cap, causing accumulation and increasing the risk of slag and other foreign matter entering the battery cells, thus affecting their reliability.
[0056] In view of this, in order to solve the problem of the reliability of the battery cell affected by the accumulation of welding slag during the welding process of the adapter plate and the end cap of the battery cell, some embodiments of this application provide a welding protective cover. The welding protective cover includes a base and a pressure head assembly. The base has an air inlet, a laser port, and an air extraction port. The pressure head assembly includes a pressure head with a first channel that extends through the pressure head in a first direction. The two ends of the first channel are a first end and a second end, respectively. The first end is connected to the base, and the laser port and the air extraction port are both connected to the first end. The size of the first channel gradually decreases from the first end to the second end. The pressure head assembly also includes an outer cover that covers at least a portion of the pressure head. There is a gap between the inner peripheral wall of the outer cover and the outer peripheral wall of the pressure head to form a second channel. The air inlet is connected to the second channel. One end of the outer cover is sealed to the pressure head, and the other end of the outer cover is open to form a welding port. The welding port is directly opposite the laser port. The welding port extends beyond the second end, and the second channel is connected to the first channel through the gap between the welding port and the second end.
[0057] The pressure head assembly is a combination of a pressure head and an outer casing. The first channel of the pressure head is connected to the laser port and the air extraction port. An air inlet is connected to a blower, and the air extraction port is connected to an exhaust system. During laser welding, positive pressure air is blown in through the air inlet. The gas enters the second channel and exits from the welding port at the bottom of the outer casing. The weld slag generated during the laser welding process at the welding port is carried from bottom to top through the first channel and then discharged from the air extraction port. Because the weld joint extends beyond the second end, there is an annular gap channel between the weld joint of the outer cover and the second end of the pressure head. The gap between the weld joint and the second end of the pressure head serves as the air outlet of the second channel. The air blown out of the air outlet towards the weld slag at the weld joint is an annular airflow. Compared with the single-point oblique airflow at the weld joint in the prior art, this application changes the airflow direction and airflow area at the weld joint. The airflow entering the second channel from the air inlet blows out of the weld joint as an annular airflow, resulting in a larger airflow area. Furthermore, the airflow direction at the weld joint is from bottom to top, and the airflow direction at the weld joint is in the same direction as the spatter direction of the weld slag at the weld joint. On the one hand, this can reduce the risk of adhesion caused by the weld slag impacting the end cap of the battery cell, thereby improving welding stability. On the other hand, under the combined effect of the circulating air blowing and the negative pressure suction of the exhaust port, the welding slag generated by laser welding at the weld joint is more likely to enter the first channel from the second end from the bottom up and then be discharged from the exhaust port at the first end. This reduces the risk of welding slag accumulation at the weld joint, and the welding part between the adapter piece and the end cap of the battery cell is cleaner and less likely to have welding slag residue. This improves the welding quality between the adapter piece and the end cap of the battery cell, and correspondingly improves the reliability of the battery cell.
[0058] This application provides a welding protective cover; please refer to... Figures 1 to 5 The welding protective cover 100 includes a base 10 and a pressure head assembly 20. The base 10 has an air inlet 11, a laser port 12, and an air extraction port 13. The pressure head assembly 20 includes a pressure head 21, which has a first channel 211 extending along a first direction X. The two ends of the first channel 211 are a first end 2111 and a second end 2112, respectively. The first end 2111 is connected to the base 10, and the laser port 12 and the air extraction port 13 are both connected to the first end 2111. The size of the first channel 211 gradually decreases from the first end 2111 to the second end 2112. 20 also includes an outer cover 22, which covers at least a portion of the pressure head 21 along the first direction X. There is a gap between the inner peripheral wall of the outer cover 22 and the outer peripheral wall of the pressure head 21 to form a second channel 23. The air inlet 11 communicates with the second channel 23. One end of the outer cover 22 is sealed to the pressure head 21, and the other end of the outer cover 22 is open and has a welding port 221. The welding port 221 is directly opposite to the laser port 12. The welding port 221 extends beyond the second end 2112, and the second channel 23 communicates with the first channel 211 through the gap between the welding port 221 and the second end 2112.
[0059] The air inlet 11 is an inlet that can blow gas into the welding protective cover 100. The air inlet 11 is set through the base 10. A blower can be connected to the air inlet 11, and the blower can blow protective gas into the pressure head assembly 20.
[0060] Laser port 12 refers to the channel through which the laser from the laser welding equipment enters. Laser port 12 and welding port 221 are positioned opposite each other, meaning they are on the same straight line. The laser emitted by the laser welding equipment enters the base 10 and pressure head 21 through laser port 12, then passes through the first channel 211 and directly irradiates the welding port 221, thereby welding the adapter plate and the end cap of the battery cell at the welding port 221. Air extraction port 13 is connected to the first channel 211 and can be connected to an air extraction device. The air extraction port 13 can generate negative pressure inside the first channel 211 through the air extraction device, causing an upward airflow within the first channel 211.
[0061] The first channel 211 refers to a channel structure that runs through the pressure head 21 along the first direction X. The first direction X can be the thickness direction of the pressure head 21. When the pressure head 21 is located at the bottom of the base 10, the first direction X is vertical. The first channel 211 is connected to the laser port 12. The laser passes through the laser port 12, the first channel 211 and the welding port 221 in sequence, realizing the function of welding the adapter piece and the end cap of the battery cell at the welding port 221.
[0062] The first end 2111 and the second end 2112 refer to the two ends of the first direction X of the pressure head 21. The first end 2111 and the second end 2112 are the opposite ends of the first channel 211. The direction from the first end 2111 to the second end 2112 is the direction from the end of the pressure head 21 closest to the base 10 to the end of the pressure head 21 away from the base 10.
[0063] The gradual decrease in size of the first channel 211 means that the opening size of the first channel 211 gradually decreases, and the rate of change of the opening size of the first channel 211 is not necessarily equal. For example, in this embodiment, the opening size of the first end 2111 of the first channel 211 is large, the opening size of the second end 2112 is small, and the cross-sectional shape of the first channel 211 is similar to that of an inverted isosceles trapezoid.
[0064] The outer cover 22 refers to the cover structure surrounding the pressure head 21. The shape of the outer cover 22 is adapted to the shape of the pressure head 21. The upper end of the outer cover 22 is sealed to the pressure head 21. The gap between the inner peripheral wall of the outer cover 22 and the outer peripheral wall of the pressure head 21 means that there is a circumferential gap between the side wall of the outer cover 22 and the pressure head 21, which forms the second channel 23. The lower end of the outer cover 22 is open to form the welding port 221. The welding port 221 contacts the welding parts of the adapter plate and the end cap of the battery cell. The air inlet 11 is connected to the second channel 23, meaning that the air inlet 11 can be directly connected to the second channel 23. Of course, the air inlet 11 can also be connected to the second channel 23 through an independent channel of the pressure head 21.
[0065] The gas blown in through the air inlet 11 enters the second channel 23 and flows from top to bottom along the annular gap of the second channel 23 to the weld joint 221 below the second channel 23, and then blows in an annular manner.
[0066] The welding joint 221 extending beyond the second end 2112 means that the welding joint 221 is further away from the base 10 than the second end 2112. The extent by which the welding joint 221 extends beyond the second end 2112 can be determined according to the actual situation. The airflow in the second channel 23 is an annular airflow at the welding joint 221 at the bottom of the outer cover 22. The annular airflow refers to the airflow along the circumference of the welding joint 221, which makes it less likely for the welding slag at the welding joint 221 to have a blind spot in the airflow. The airflow from the bottom of the welding joint 221 can quickly disperse the smoke / plasma cloud above the molten pool of the welding joint 221, reduce the deflection / energy attenuation caused by the laser passing through, and improve the stability of the welding. Under the action of the annular airflow and the negative pressure of the exhaust port 13, the welding slag at the welding joint 221 enters the first channel 211 and is discharged from the exhaust port 13 of the first channel 211 from bottom to top.
[0067] In the technical solution of this application embodiment, the base 10 is provided with an air inlet 11, a laser port 12, and an air extraction port 13. The pressure head assembly 20 is disposed on one side of the bottom of the base 10. The pressure head assembly 20 is composed of a pressure head 21 and an outer cover 22. The first channel 211 of the pressure head 21 is connected to the laser port 12 and the air extraction port 13. There is a gap between the inner peripheral wall of the outer cover 22 and the outer peripheral wall of the pressure head 21, forming a second channel 23. One end of the outer cover 22 is sealed to the pressure head 21, and the other end of the outer cover 22 is open and forms a welding port 221 that communicates with the second channel 23. The welding port 221 contacts the component to be welded, such as an adapter piece. The laser port 12 allows laser light to enter and exit from the welding port 221, realizing laser welding between the adapter piece and the end cap of the battery cell.
[0068] The air inlet 11 is connected to a blower, and the air outlet 13 is connected to an exhaust device. During laser welding, positive pressure air is blown from the air inlet 11. After the gas enters the second channel 23, it is blown out from the welding port 221 at the bottom of the outer cover 22. The welding slag generated during the laser welding process at the welding port 221 is discharged from the bottom to the top through the first channel 211 and then from the exhaust port 13. Since the weld joint 221 extends beyond the second end 2112, there is an annular gap channel between the weld joint 221 of the outer cover 22 and the second end 2112 of the pressure head 21. The gap between the weld joint 221 and the second end 2112 of the pressure head 21 is the air outlet of the second channel 23. The air blown out of the air outlet towards the welding slag at the weld joint 221 is an annular airflow. Compared with the single-point oblique airflow at the weld joint 221 in the prior art, this application changes the airflow direction and airflow area at the weld joint 221. The airflow entering the second channel 23 from the air inlet 11 blows out of the weld joint 221 as an annular airflow, with a larger airflow area. Moreover, the airflow direction at the weld joint 221 is from bottom to top, and the airflow direction at the weld joint 221 is in the same direction as the spatter direction of the welding slag at the weld joint 221. On the one hand, this can reduce the risk of adhesion caused by the welding slag hitting the end cap of the battery cell and improve the welding stability. On the other hand, under the combined action of the circulating air blowing and the negative pressure suction of the exhaust port 13, the welding slag generated by laser welding at the welding joint 221 is more likely to enter the first channel 211 from the second end 2112 from the bottom up and then be discharged from the exhaust port 13 of the first end 2111. This reduces the risk of welding slag accumulation at the welding joint 221, and the welding part between the adapter piece and the end cover of the battery cell is cleaner and less likely to have welding slag residue. This improves the welding quality between the adapter piece and the end cover of the battery cell and correspondingly improves the reliability of the battery cell.
[0069] According to some embodiments of this application, the weld joint 221 extends beyond the second end 2112 by 2mm-5mm.
[0070] The extension of weld joint 221 beyond the second end 2112 by 2mm-5mm means that the extension of weld joint 221 beyond the second end 2112 can be any value such as 2mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm or 5.0mm. The value of the extension of weld joint 221 beyond the second end 2112 can be determined according to the actual situation.
[0071] Limiting the extension of the weld joint 221 beyond the second end 2112 to within a certain range ensures that the annular airflow from the bottom of the second channel 23 has adequate outlet space to blow the weld slag at the weld joint 221 into the first channel 211 from bottom to top along a predetermined direction. When the extension of the weld joint 221 beyond the second end 2112 is less than 2mm, the gap between the weld joint 221 and the second end 2112 in the first direction X is too small, resulting in a small outlet area and affecting the blowing effect of the annular airflow on the weld slag. When the extension of the weld joint 221 beyond the second end 2112 is greater than 4mm, the gap between the weld joint 221 and the second end 2112 in the first direction X is too large, resulting in an excessively large outlet area, reducing the annular airflow velocity at the weld joint 221, and affecting the slag removal effect of the annular airflow at the weld joint 221.
[0072] According to some embodiments of this application, the welding port 221 is coaxially arranged with the second end 2112, and the diameter of the welding port 221 is equal to the diameter of the second end 2112.
[0073] The coaxial arrangement of the weld joint 221 and the second end 2112 means that the weld joint 221 and the second end 2112 are directly opposite each other. The equal diameter of the weld joint 221 and the second end 2112 means that the opening size of the weld joint 221 is equal to the diameter of the second end 2112. However, this is not a limitation; in some embodiments, the diameter of the weld joint 221 may be slightly larger than the diameter of the second end 2112.
[0074] The welding port 221 and the second end 2112 are coaxially arranged, and the diameter of the welding port 221 is equal to that of the second end 2112. That is, the second end 2112 is located directly above the welding port 221, and the opening size of the two is equal. Compared with the welding port 221 and the second end 2112 being misaligned or having unequal sizes, when the welding slag at the welding port 221 moves from bottom to top under the action of the circulating air and the negative pressure adsorption force of the exhaust port 13, the welding slag is more likely to enter the first channel 211 directly from the second end 2112 along the direction of the airflow, and is less likely to generate turbulence.
[0075] Based on some embodiments of this application, please refer to... Figure 2 and Figure 5 The air inlet 11 and the air outlet 13 are located on both sides of the laser port 12 in the second direction Y, which is perpendicular to the first direction X.
[0076] The second direction Y is perpendicular to the first direction X. Taking the first direction X as the thickness direction of the cover plate as an example, the second direction Y can be the length direction of the cover plate.
[0077] With the air inlet 11 and the air outlet 13 respectively located on both sides of the laser port 12, the gas enters from the first direction X side of the cover plate and is blown out from the other side of the first direction X of the laser port 12 on the cover plate. Compared with the air inlet 11 and the air outlet 13 being located on the second direction Y side of the laser port 12, the distance between the air inlet 11 and the air outlet 13 in the second direction Y of the cover plate is larger. Consequently, the angle between the air inlet channel and the air outlet channel inside the pressure head assembly 20 can be set to be larger, which is more conducive to the spatial layout of the channels of the pressure head assembly 20.
[0078] According to some embodiments of this application, please refer to Figure 2 and Figure 3 The pressure head 21 has a third channel 212 extending through it below the air inlet 11. The third channel 212 is set independently from the first channel 211. The air inlet 11 is connected to the second channel 23 through the third channel 212.
[0079] The third channel 212 is set independently from the first channel 211. The third channel 212 is a channel set independently inside the pressure head 21. The third channel 212 is not connected to the first channel 211. The upper end of the third channel 212 is connected to the air inlet 11, and the lower end of the third channel 212 is connected to the second channel 23.
[0080] By providing a third channel 212 on the pressure head 21, the air inlet 11 can be connected to the second channel 23 via the third channel 212. The air blown in from the air inlet 11 can directly enter the second channel 23 through the third channel 212. The air inlet 11 does not need to be directly connected to the gap between the pressure head 21 and the outer cover 22. The flow channel size of the third channel 212 can be set according to the requirements, so that the air from the air inlet 11 can enter the second channel 23 more smoothly and evenly. Furthermore, there is no need to set a gap between the outer peripheral wall of the pressure head 21 and the part of the outer cover 22 near the base 10, which is more conducive to the assembly of the pressure head 21 and the outer cover 22.
[0081] According to some embodiments of this application, please refer to Figure 3 The pressure head 21 includes a first sidewall 213 and a second sidewall 214 that are relatively distributed along the second direction Y, and a third sidewall 215 and a fourth sidewall 216 that are relatively distributed along the third direction Z. The first sidewall 213, the third sidewall 215, the second sidewall 214 and the fourth sidewall 216 are connected in sequence to form a first channel 211. The air extraction port 13 is located at the first end 2111 and is set close to the first sidewall 213. The third channel 212 is disposed through the second sidewall 214. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.
[0082] The first sidewall 213, the third sidewall 215, the second sidewall 214 and the fourth sidewall 216 are connected in sequence to form the pressure head 21. The shapes of the first sidewall 213, the second sidewall 214, the third sidewall 215 and the fourth sidewall 216 can all be different.
[0083] The first direction X, the second direction Y, and the third direction Z are mutually perpendicular, meaning that any two of the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. If the first direction X is the thickness direction of the pressure head 21, then the second direction Y can be the length direction of the pressure head 21, and the third direction Z is the width direction of the pressure head 21.
[0084] The pressure head 21 includes a first sidewall 213 and a second sidewall 214 distributed relatively along the second direction Y, and a third sidewall 215 and a fourth sidewall 216 distributed relatively along the third direction Z. The pressure head 21 is formed by the four sidewalls, and its structure is simple and easy to manufacture. The air extraction port 13 is located at the first end 2111 of the first channel 211 and close to the first sidewall 213. The third channel 212 passes through the second sidewall 214. That is, the air extraction port 13 and the air inlet 11 are located on both sides of the second direction Y, which is more conducive to the rational layout of the air field inside the pressure head assembly 20.
[0085] According to some embodiments of this application, the included angle between the first sidewall 213 and the second sidewall 214 is an obtuse angle.
[0086] The angle between the first sidewall 213 and the second sidewall 214 is an obtuse angle. In some embodiments, the angle between the first sidewall 213 and the second sidewall 214 can be 120°-160°, which allows the air from the second channel 23 to enter the first channel 211 and move along the wall of the first sidewall 213 towards the exhaust port 13. The wall surface of the first sidewall 213 is more gentle, which is more conducive to the discharge of welding slag from the exhaust port 13, and the discharge effect of welding slag is better.
[0087] The angle between the first sidewall 213 and the second sidewall 214 is an obtuse angle, that is, the angle formed by the air inlet 11, the welding port 221 and the air extraction port 13 is an obtuse angle, which is more conducive to the layout of the air field inside the pressure head assembly 20. The larger the angle between the first sidewall 213 and the second sidewall 214, the more conducive it is to the smooth discharge of welding slag.
[0088] According to some embodiments of this application, the angle between the first sidewall 213 and the base 10 is smaller than the angle between the second sidewall 214 and the base 10.
[0089] The angle between the first sidewall 213 and the base 10 can be α, and the angle between the second sidewall 214 and the base 10 can be β, where α < β. The value of α can range from 30° to 60°, and the value of β can range from 60° to 90°.
[0090] The angle between the first sidewall 213 and the base 10 is smaller than the angle between the second sidewall 214 and the base 10. That is, the first sidewall 213 is gentler than the second sidewall 214. The exhaust port 13 is located close to the first sidewall 213, which makes it easier for the welding slag in the first channel 211 to be discharged along the extension direction of the first sidewall 213. The gentler first sidewall 213 reduces the difficulty of welding slag discharge and can effectively prevent welding slag from falling into the welding joint 221, thus improving the welding slag discharge effect.
[0091] According to some embodiments of this application, the cross-sectional shape of the second end 2112 is circular, and the cross-sectional shape of the weld joint 221 is circular.
[0092] Of course, the cross-sectional shape of the second end 2112 and the cross-sectional shape of the weld joint 221 can also be square or other shapes.
[0093] The cross-sectional shape of both the second end 2112 and the weld joint 221 is circular, which makes it easier to achieve annular air blowing of the weld slag at the weld joint 221, resulting in more uniform airflow and better dust removal effect on the weld slag.
[0094] According to some embodiments of this application, the outer cover 22 is detachably connected to the pressure head 21.
[0095] The connection between the outer cover 22 and the pressure head 21 can be achieved in various ways, including screwing, snap-fitting, or interference fit. In this embodiment, the outer cover 22 and the pressure head 21 are fixed by screwing. The top of the outer cover 22 has a first connecting hole 222, and the top of the pressure head 21 has a corresponding second connecting hole 217. Fasteners pass through the first connecting hole 222 and the second connecting hole 217 to screw the outer cover 22 and the pressure head 21 together. The fasteners can be screws.
[0096] The outer cover 22 is detachably connected to the pressure head 21, making it easy to install and remove the pressure head 21 and the outer cover 22, which is beneficial for subsequent maintenance of the outer cover 22 and the pressure head 21.
[0097] According to some embodiments of this application, please refer to Figure 2 The pressure head 21 is buoyantly connected to the base 10 along the first direction X.
[0098] The base 10 and the pressure head 21 can be connected by a floating spring. The spring 33 has a certain buffering capacity, which allows the pressure head 21 to float relative to the base 10 in the first direction X, reducing the risk of rigid contact and collision between the weld joint 221 and the adapter plate.
[0099] Multiple floating components 30 are provided between the pressure head 21 and the base 10. Each floating component 30 includes a guide sleeve 32, a guide rod 31, and a spring 33. The guide sleeve 32 is located at the top of the pressure head 21, and the guide rod 31 is located at the bottom of the base 10. The guide rod 31 and the guide sleeve 32 are slidably engaged along a first direction X, and the guide rod 31 and the guide sleeve 32 are inseparable. The spring 33 is located in the guide groove of the guide sleeve 32, and its two ends are connected to the guide rod 31 and the guide sleeve 32, respectively. When the pressure head 21 is subjected to compressive force, the guide sleeve 32 and the guide rod 31 slide relative to each other along the first direction X, and the spring 33 is deformed by the compressive force, providing a cushioning effect.
[0100] Of course, in order to improve the stability of the floating between the pressure head 21 and the base 10, the pressure head 21 is provided with a hook part 218 on the outside, and the outer wall of the base 10 is provided with a slot 15 for the hook part 218 to hook and cooperate. The hook part 218 is hooked on the slot 15, and the hook part 218 can float up and down along the first direction X on the slot 15.
[0101] The pressure head 21 is buoyantly connected to the base 10 along the first direction X, which reduces the risk of overpressure on the adapter plate by the welding protective cover 100, allowing the pressure head 21 to be fully pressed on the surface of the adapter plate, improving the dustproof effect and ensuring welding quality.
[0102] According to some embodiments of this application, please refer to Figure 1 and Figure 2 The number of pressure head assemblies 20 is two, and the two pressure head assemblies 20 are distributed at intervals along the second direction Y on the base 10, and the second direction Y is perpendicular to the first direction X.
[0103] By setting the number of pressure head assemblies 20 to two, the two pressure head assemblies 20 can simultaneously weld the components to be welded, such as two adapter pieces on a battery cell, thereby improving welding efficiency.
[0104] This application also provides a battery manufacturing apparatus, which includes the welding protective cover of any of the foregoing embodiments.
[0105] In some embodiments, please refer to Figures 1 to 5The welding protective cover 100 includes a base 10 and a pressure head assembly 20. The base 10 has an air inlet 11, a laser port 12, and an air extraction port 13. The pressure head assembly 20 includes a pressure head 21, which has a first channel 211 extending along a first direction X. The two ends of the first channel 211 are a first end 2111 and a second end 2112, respectively. The first end 2111 is connected to the base 10, and the laser port 12 and the air extraction port 13 are both connected to the first end 2111. The size of the first channel 211 gradually decreases from the first end 2111 to the second end 2112. The head assembly 20 also includes an outer cover 22, which is disposed on the outer periphery of the pressure head 21. A gap exists between the inner peripheral wall of the outer cover 22 and the outer peripheral wall of the pressure head 21 to form a second channel 23, through which the air inlet 11 communicates. One end of the outer cover 22 is sealed to the pressure head 21, while the other end of the outer cover 22 is open and forms a welding port 221, which is directly opposite the laser port 12. The welding port 221 extends beyond the second end 2112, and the second channel 23 communicates with the first channel 211 through the annular gap between the welding port 221 and the second end 2112. The welding port 221 extends 2mm-5mm beyond the second end 2112, and the welding port 221 and the second end 2112 are coaxially arranged, with the diameter of the welding port 221 being equal to the diameter of the second end 2112.
[0106] During laser welding, positive pressure air is blown from the air inlet 11. After the gas enters the second channel 23, it is blown out from the welding port 221 at the bottom of the outer cover 22. The welding slag generated during the laser welding process at the welding port 221 is discharged from the exhaust port 13 after passing through the first channel 211 from bottom to top. Since the weld joint 221 extends beyond the second end 2112, there is an annular gap channel between the weld joint 221 of the outer cover 22 and the second end 2112 of the pressure head 21. The gap between the weld joint 221 and the second end 2112 of the pressure head 21 is the air outlet of the second channel 23. The air blown out of the air outlet towards the welding slag at the weld joint 221 is an annular airflow. Compared with the single-point oblique airflow at the weld joint 221 in the prior art, this application changes the airflow direction and airflow area at the weld joint 221. The airflow entering the second channel 23 from the air inlet 11 blows out of the weld joint 221 as an annular airflow, with a larger airflow area. Moreover, the airflow direction at the weld joint 221 is from bottom to top, and the airflow direction at the weld joint 221 is in the same direction as the spatter direction of the welding slag at the weld joint 221. On the one hand, this can reduce the risk of adhesion caused by the welding slag hitting the end cap of the battery cell and improve the welding stability. On the other hand, under the combined action of the circulating air blowing and the negative pressure suction of the exhaust port 13, the welding slag generated by laser welding at the welding joint 221 is more likely to enter the first channel 211 from the second end 2112 from the bottom up and then be discharged from the exhaust port 13 of the first end 2111. This reduces the risk of welding slag accumulation at the welding joint 221, and the welding part between the adapter piece and the end cover of the battery cell is cleaner and less likely to have welding slag residue. This improves the welding quality between the adapter piece and the end cover of the battery cell and correspondingly improves the reliability of the battery cell. The welding port 221 and the second end 2112 are coaxially arranged, and the diameter of the welding port 221 is equal to that of the second end 2112. That is, the second end 2112 is located directly above the welding port 221, and the opening size of the two is equal. Compared with the welding port 221 and the second end 2112 being misaligned or having unequal sizes, when the welding slag at the welding port 221 moves from bottom to top under the action of the circulating air and the negative pressure adsorption force of the exhaust port 13, the welding slag is more likely to enter the first channel 211 directly from the second end 2112 along the direction of the airflow, and is less likely to generate turbulence.
[0107] In some embodiments, the air inlet 11 and the air outlet 13 are located on both sides of the laser port 12 in the second direction Y, which is perpendicular to the first direction X. The pressure head 21 has a third channel 212 extending through it below the air inlet 11. The third channel 212 is independently configured from the first channel 211, and the air inlet 11 is connected to the second channel 23 through the third channel 212.
[0108] With the air inlet 11 and the air outlet 13 respectively located on both sides of the laser port 12, the gas enters from the first direction X side of the cover plate and is blown out from the other side of the first direction X of the laser port 12 on the cover plate. Compared with the air inlet 11 and the air outlet 13 being located on the second direction Y side of the laser port 12, the distance between the air inlet 11 and the air outlet 13 in the second direction Y of the cover plate is larger. Consequently, the angle between the air inlet channel and the air outlet channel inside the pressure head assembly 20 can be set to be larger, which is more conducive to the spatial layout of the channels of the pressure head assembly 20. By providing a third channel 212 on the pressure head 21, the air inlet 11 can be connected to the second channel 23 via the third channel 212. The air blown in from the air inlet 11 can directly enter the second channel 23 through the third channel 212. The air inlet 11 does not need to be directly connected to the gap between the pressure head 21 and the outer cover 22. The flow channel size of the third channel 212 can be set according to the requirements, so that the air from the air inlet 11 can enter the second channel 23 more smoothly and evenly. Furthermore, there is no need to set a gap between the outer peripheral wall of the pressure head 21 and the part of the outer cover 22 near the base 10, which is more conducive to the assembly of the pressure head 21 and the outer cover 22.
[0109] In some embodiments, the pressure head 21 includes a first sidewall 213 and a second sidewall 214 distributed opposite to each other along the second direction Y, and a third sidewall 215 and a fourth sidewall 216 distributed opposite to each other along the third direction Z. The first sidewall 213, the third sidewall 215, the second sidewall 214, and the fourth sidewall 216 are sequentially connected to form a first channel 211. The air extraction port 13 is located at the first end 2111 and is disposed close to the first sidewall 213. The third channel 212 is disposed through the second sidewall 214. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The angle between the first sidewall 213 and the second sidewall 214 is an obtuse angle, and the angle between the first sidewall 213 and the base 10 is smaller than the angle between the second sidewall 214 and the base 10. The cross-sectional shape of the second end 2112 is circular, and the cross-sectional shape of the weld joint 221 is circular.
[0110] The angle between the first sidewall 213 and the base 10 is smaller than the angle between the second sidewall 214 and the base 10, meaning the first sidewall 213 is gentler than the second sidewall 214. The exhaust port 13 is positioned close to the first sidewall 213, facilitating the discharge of welding slag from the first channel 211 along the extension direction of the first sidewall 213. The gentler slope of the first sidewall 213 reduces the difficulty of slag discharge, effectively preventing slag from falling into the weld joint 221 and improving slag removal efficiency. The circular cross-sectional shape of both the second end 2112 and the weld joint 221 further facilitates annular airflow to the welding slag at the weld joint 221, resulting in more uniform airflow and better dust removal.
[0111] In some embodiments, the outer cover 22 is detachably connected to the pressure head 21, and the pressure head 21 is buoyantly connected to the base 10 along a first direction X. There are two pressure head assemblies 20, spaced apart on the base 10 along a second direction Y, which is perpendicular to the first direction X. The buoyant connection between the pressure head 21 and the base 10 along the first direction X reduces the risk of overpressure on the adapter piece by the welding protective cover, allowing the pressure head 21 to be fully pressed against the surface of the adapter piece, improving dust protection and ensuring welding quality. By using two pressure head assemblies 20, two pressure head assemblies 20 can simultaneously weld two adapter pieces on the components to be welded, such as a battery cell, improving welding efficiency.
[0112] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A welding shield characterized by, The application relates to a welding protective cover. The base is provided with an air inlet, a laser inlet and an air outlet. The pressure head assembly comprises a pressure head, the pressure head is provided with a first channel penetrating in a first direction, two ends of the first channel are a first end and a second end respectively, the first end is connected with the base, the laser inlet and the air outlet are communicated with the first end; the size of the first channel gradually decreases from the first end to the second end. The pressure head assembly further comprises an outer cover, the outer cover covers at least part of the pressure head in the first direction, a gap is formed between the inner wall of the outer cover and the outer wall of the pressure head to form a second channel, the air inlet is communicated with the second channel; one end of the outer cover is sealingly connected with the pressure head, the other end of the outer cover is open and provided with a welding interface, the welding interface is arranged opposite to the laser inlet; the welding interface is arranged beyond the second end, the second channel is communicated with the first channel through the gap between the welding interface and the second end.
2. The welding boot cover of claim 1, wherein, The welding interface is arranged coaxially with the second end, and the caliber of the welding interface is equal to the caliber of the second end.
3. The welding boot cover of claim 1, wherein, The air inlet and the air outlet are respectively arranged on two sides of the laser inlet in a second direction, and the second direction is perpendicular to the first direction.
4. The welding boot cover of claim 1, wherein, The pressure head is provided with a third channel penetrating below the air inlet, the third channel is independently arranged with the first channel, and the air inlet is communicated with the second channel through the third channel.
5. The welding boot cover of claim 4, wherein, The pressure head comprises a first side wall and a second side wall oppositely arranged in the second direction, and a third side wall and a fourth side wall oppositely arranged in a third direction, the first side wall, the third side wall, the second side wall and the fourth side wall are sequentially connected to form the first channel.
6. The welding shield of claim 5, wherein, The air outlet is arranged on the first end and close to the first side wall, the third channel is arranged penetrating through the second side wall, and the first direction, the second direction and the third direction are perpendicular to each other. The included angle between the first side wall and the second side wall is obtuse.
7. The welding boot cover of claim 6, wherein, The included angle between the first side wall and the base is smaller than the included angle between the second side wall and the base.
8. The welding boot cover of claim 6, wherein, The cross-sectional shape of the second end is circular, and the cross-sectional shape of the welding interface is circular.
9. The welding boot cover of claim 1, wherein, The outer cover and the pressure head are detachably connected.
10. The welding boot cover of claim 1, wherein, The pressure head and the base are floatingly connected in the first direction.
11. The welding boot cover of claim 10, wherein, The number of the pressure head assemblies is two, and the two pressure head assemblies are spaced apart from each other in a second direction perpendicular to the first direction.
12. The welding boot cover of claim 1, wherein, The welding protective cover comprises the welding protective cover according to any one of claims 1-12.
13. A battery manufacturing apparatus, characterized by comprising: